Lock



J. W. LINDBERG.

LOCK.

APPLICATION FILED APR. 22. 1918.

Patented Feb. 3,1920.

Invenfor' LINDBEno,a subject of the King'ofi Sweden,-

' the keys will be materially reduced and it- PATENTLOFF-IGE;

i Y 30mm watiiumanaumnmne, or stroCKHo SWEDEN.

To all whom it may concern: Be it known that I, JOHAN, lVALDEMAR residing-at Stockholm, in the Kingdom of Sweden, have invented a new and useful" Improvement in Locks, of-which the following-is aspeclfication. 7

This invention relates to an improvement in locks having for its purpose to substi-' heretofore used, In this manner "the costof will also be possiblewhen making the' key simultaneously to punch or press out the various steps or teeth of thebit, thatis-tosay. the face of the key, if desired;

Thepresent invention is broadly characterized by this, that the key-hole in the top plate or the bottom plate ofthelock con sists of a-semi-circular or nearly semi-circular slot and'a slot for'the'key-bit extend-- ing preferably radially from the" firstenamed slot. The? other plateof the lock may preferably. be provided with a slot or 'adepression ;-corresponding ornearly correspondingtoithe semi-circular slot "in the first-named plate. The key of the'lock is broadly characterized by this that its pipe or shank has about-semi-circular crosssection and is provided with a bit extending preferably radially from the same.

In the accompanying drawing there are shown by way of example two embodiments of the invention. spective view of a lock with its key-guard and key, according to the first embodiment.

Fig. '2 shows a side view of the key and Fig. 3 shows a section of the key-shaft on the line III-III in Fig. 2. Fig. 4 shows the key-guard, Fig. 5 shows the top plate of the lock, and Fig. 6 shows the bottom plate of the lock, a key-support secured to the'same being shown in section. Fig. 7 shows a section of the key according to the other embodiment, Fig. 8 shows the corresponding key-guard, Fig. 9 the top plate of the lock, and Fig. 10 the bottom plate of the lock.

The key 1 may be punched orlpressed out of a metal sheet of suitable thickness, and it.

is provided with a semi-cylindrical groove 2 pressed simultaneously or afterward, so that the pipe or the shank 3 shows the form of approximately half a cylindrical shell.

Specification of Lettersjlatent. I

Figure 1 shows a per- F rom this shell the bit lextends, the face of which may be pressed out simultaneously about radial direction. tutekeys punched or pressed out of sheeto metal for the forged ordrop-forged keys plate 9 Y of. the lock is preferably provided Patented'Feb. 3,192.0. Applicationfiledltpril 22, 1 18. Serial No. 230,071..

with a circular slot 10 or a depressionwhich serves for. guiding the end of the-key. This greater angle than the sum of the angle taken up bythe key-shank and? the angle whichthe'key-is to be turnedi The key-guard l1 is provided with'a keyhole corresponding to the hole in thetop plate of the lock, butthe semi-circular:por-

slot 1O' need" of course not extend over. a

tion-of-this key-hole is extended in the direction of turningof the key equally or'a little more than the angle of turning of the key-so as to enable the key tobe turned in the slot in the key-guard without the key having to be provided with an extra slot.

Between the top plate and the bottom plate of the lock there is preferably secured a member or a support 20 which borders the edges of the slots 6 and 7in the top plate and the slot 10 in the bottom plate. The support 20 thus extends parallelly with the direction of the key-hole, that is to say in ordinary cases it extends at right angles to the top plate and the bottom plate of the look. When the key is introduced in the key-hole it gains support against the member 20 sothat it will be prevented'from moving in lateral directions. It will be un-,

derstood that the support 20 is only provided along the edges of the slots 6, 7 and 10 which do not lie within the angle of turning of the key, as the support would otherwise prevent the key-bit from being in the key-hole in the top plate of the lock is of course provided in the edge of the keyshank opposite the key-bit. The slot 13 in the key-guard 15 and the slot 1 1 in the bottom plate 16 of the lock are preferably also in this case extended in the direction of I turning of the key relatively to the slot 17 in the top plate 18 of the look, as will be understood from the drawing.

It will be understoodthat the invention is not limited to the embodiments above described and illustrated in the drawing, but

that alterations may be made within the,

scope of the invention as set forth in the claims. .The key need for instance not be provided with a slot 8, but the slot 6 in the top plate of the lock may be correspondingly extended. On the other hand, instead of making the slot 10 extended, the key may be provided with a corresponding slot or recess at its end. The key-bit and the slot corresponding to the same need of course not extend radially from the key-shank and need not be straight,but may be bent to a suitable I claim: h

1. In a lock the combination of a top plate providedwith a key-hole consisting of an approximately semi-circular slot and a slot extending about radially from the firstnamed slot, and a bottom plate provided with a slot corresponding to the semi-circur lar slot in the top plate.

2. In a lock the combination of a top plate provided with a key-hole consisting of an approximately semi-circular slot and a slot extending about radially from the firstnamed slot, and a support extending from the edges ofthe said key-hole parallelly with the direction of the key-hole.

3. In a lock the combination of a top plate I provided with a key-hole consisting of an approximately, semi-circular slot and'a slot extending about radially from the firstnamed slot, a bottom plate provided with slot corresponding to the semi-circular slot in the top plate, and supports between the top plate and the bottom plate extending from the edges of the key-hole in the top plate and adjacent to the key position but outside of the same to prevent interference when the key is turned. i

,4. The combination'with a look provided with a key-hole consisting of an approximately semi-circular slot and a slot extendingabout radially from the firstnamed slot, of a key provided with a shank of about semi-circular cross section and a key-bit extending about radially from said shank.

5. The combination with a lock provided with a key-hole consisting of an approxi mately semi-circular slot and a slot extending about radially from the firstnamed slot, of a key provided with a shank of about semi-circular cross section and a key-bit extending about radially from said shank and with a slot in the shank, said slot having an angular extension equal to the angle of turning of the key in the lock.

" JOHAN WALDEMARYLINDBERG. 

